EP3307951B1 - Utilisation de fibres cellulosique pour la fabrication d'un non-tissé - Google Patents

Utilisation de fibres cellulosique pour la fabrication d'un non-tissé Download PDF

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Publication number
EP3307951B1
EP3307951B1 EP16713279.4A EP16713279A EP3307951B1 EP 3307951 B1 EP3307951 B1 EP 3307951B1 EP 16713279 A EP16713279 A EP 16713279A EP 3307951 B1 EP3307951 B1 EP 3307951B1
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EP
European Patent Office
Prior art keywords
lyocell fibers
web
foam
fibrous web
wipes
Prior art date
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EP16713279.4A
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German (de)
English (en)
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EP3307951A1 (fr
Inventor
Gisela Goldhalm
Thomas Maier
Gert Kroner
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Lenzing AG
Original Assignee
Lenzing AG
Chemiefaser Lenzing AG
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Publication of EP3307951A1 publication Critical patent/EP3307951A1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K7/00—Body washing or cleaning implements
    • A47K7/04—Mechanical washing or cleaning devices, hand or mechanically, i.e. power operated
    • A47K7/043—Mechanical washing or cleaning devices, hand or mechanically, i.e. power operated hand operated
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/002—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines by using a foamed suspension
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/04—Kraft or sulfate pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/02—Synthetic cellulose fibres
    • D21H13/08—Synthetic cellulose fibres from regenerated cellulose
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D21H21/20—Wet strength agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/22—Agents rendering paper porous, absorbent or bulky
    • D21H21/24—Surfactants
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/56—Foam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply

Definitions

  • This invention relates to the use of Lyocell fibers with a tendency to fibrillate for the manufacture of a nonwoven fibrous web material, in particular for the use in a wipe, by using a foam technique.
  • nonwoven fibrous web materials are also referred to as papers and vice versa and terms like “paper machine”, “paper making” etc. should be understood accordingly.
  • GB 1 395 757 there is described an apparatus for producing a foamed fiber dispersion for use in the manufacture of paper.
  • a surface active agent is added to fibrous pulp with a fibre length in excess of about 3 mm, to provide a dispersion with an air content of at least 65 %, to be discharged onto the forming fabric of a papermaking machine.
  • the aim is to achieve uniform formation of the fibrous web on the fabric.
  • foam forming With foam forming a higher bulk (lower density) can be obtained as compared to normal wet forming.
  • the main drawbacks are the loss of elastic modulus ("softness") and internal strength.
  • softness the loss of elastic modulus
  • internal strength the same characteristics are advantages in tissue making.
  • foam forming has been much more common in tissue paper products, e.g. wipes.
  • MFC microfibrillated cellulose
  • MFC has not won extensive use in paper industry so far.
  • manufacture of derivatized MFCs is costly due to the additional chemical derivatisation step and the functional groups on the cellulose chain may change the properties of the final product in a disadvantageous way.
  • WO 2013/160553 discloses an approach to overcome or substantially reduce the above problems regarding printing and packaging papers and boards, by way of finding a method of making a foam formed fibrous web, lending a substantially increased strength to paper and board products while preserving the low density.
  • the solution according to WO 2013/160553 is production of a web through the steps of (i) providing a foam of water and a surfactant, (ii) incorporating microfibrillated cellulose together with a pulp of a greater fibre length in the foam, (iii) supplying the foam onto a forming fabric, (iv) dewatering the foam on the forming fabric by suction to form a web, and (v) subjecting the web to final drying.
  • WO 2013/160553 discloses that a pulp of a high fiber length, mechanical or chemical, can be advantageously used in foam forming in combination with microfibrillated cellulose. Even though use of MFC in papermaking is known as such, incorporation of MFC into a foam is considered as not having been suggested in the prior art, and the benefits were not foreseeable to a skilled person. Nevertheless the web-forming method according to WO 2013/160553 requires the energy-consuming step of pretreating the cellulose in order to obtain microfibrillation and the resulting web still lacks sufficient strength required for many applications such as in wipes for household, body care, hygiene etc.
  • the solution according to the invention is the manufacture of a fibrous web of paper comprising the steps of (i) providing a foam of water and a surfactant, (ii) incorporating Lyocell fibers together with a pulp of a greater fibre length in the foam, (iii) supplying the foam onto a forming fabric, (iv) dewatering the foam on the forming fabric by suction to form a web, and (v) subjecting the web to final drying.
  • Lyocell fibers leads to fibrous web materials with increased strength as will be shown below.
  • the Lyocell fibers are Lyocell fibers with a titer of between 0,5 and 30 dtex, preferably between 0,9 and 15 dtex, especially preferred between 0,9 and 4 dtex, a cut length of between 1 and 40 mm and a fibrillation coefficient Q of between 10 and 50.
  • t CSF200 is the time (in min) needed to obtain a CSF value of 200 in the CSF test.
  • the CSF test will be performed with a staple length of 5 mm and thereafter be tested according to Canadian Standard Freeness - TAPPI Standard T227 om-94. The larger Q is, the shorter is the time needed to obtain the same degree of fibrillation under the same fibrillation conditions.
  • the Lyocell fibers are Lyocell fibers with a titer of between 0,5 and 30 dtex, preferably between 0,9 and 15 dtex, especially preferred between 0,9 and 4 dtex, and a fibrillation coefficient Q of between 10 and 65.
  • the Lyocell fibers are Lyocell fibers with an increased tendency to fibrillate (herein also referred to as CLY-HF, i.e "Lyocell-High-Fibrillating").
  • CLY-HF i.e "Lyocell-High-Fibrillating”
  • Such Lyocell fibers show a fibrillation coefficient Q of between 20 and 50.
  • the Lyocell fibers are Lyocell fibers with a titer of between 0,5 and 30 dtex, preferably between 0,9 and 15 dtex, especially preferred between 0,9 and 4 dtex, and a fibrillation coefficient Q of between 20 and 65.
  • the Lyocell fibers are Lyocell fibers with a cut length of between 2,5 and 22 mm, especially preferred between 3 and 12 mm, and in particular preferred between 4 and 10 mm. Shorter Lyocell fibers will not enhance the physical properties of the fibrous web and longer Lyocell fibers cannot be dispersed with sufficient homogeneity within the whole process.
  • the pulp to be combined with Lyocell fibers by definition has a relatively great fibre length, preferably about 1 mm or more.
  • a pulp of a high fiber length can be advantageously used in foam forming in combination with Lyocell fibers.
  • the ratio of the average length of the Lyocell fibers to the average length of the pulp fibers is between 1:1 and 10:1 (length of Lyocell fibers : length of pulp fibers).
  • U.S. 6,042,769 discloses a method by means of which the fibrillation tendency of Lyocell fibers is increased through a treatment that reduces the degree of polymerization of the cellulose by at least 200 units.
  • the fiber obtained in this way should be used especially in nonwovens and paper.
  • the treatment is carried out with a bleaching agent, especially with sodium hypochlorite.
  • acid preferably with a mineral acid such as hydrochloric acid, sulfuric acid, or nitric acid, is also possible. This method has so far not been implemented on a commercial scale.
  • This acid treatment can be performed by impregnating fiber tow extruded from spinnerets in a known manner according to the lyocell process and having an individual fiber titer between 1.0 and 6.0 dtex, with diluted mineral acid such as hydrochloric, sulfuric or nitric acid, for example, having a concentration between 0.5 and 5% at room temperature in a vessel at a liquor ratio of for example 1:10 and then pressing it to a certain residual moisture of, for example, 200%. Subsequently, the impregnated fiber tow is subjected to steam at positive pressure in a suitable apparatus, and then washed free of acid and dried.
  • diluted mineral acid such as hydrochloric, sulfuric or nitric acid
  • Long fibre pulps particularly useful in the invention are chemical pulps, chemimechanical pulp (CMP), thermomechanical pulp (TMP), chemothermomechanical pulp (CTMP), GW, and other high yield pulps such as APMP and NSSC.
  • CMP chemimechanical pulp
  • TMP thermomechanical pulp
  • CMP chemothermomechanical pulp
  • GW GW
  • other high yield pulps such as APMP and NSSC.
  • the long pulp fibres provide the bulky structure and the Lyocell fibers provide the bonding between the long fibres.
  • the method according to the invention has been found to achieve a bulk of between 2,5 cm 3 /g and 15 cm 3 /g, preferably of between 8,0 cm 3 /g and 11 cm 3 /g.
  • foam forming prevents flock formation between long fibres, very good grammage formation can be gained. This improves the evenness of the print quality as there is less calibre variation in the paper.
  • a continuous fibrous web is formed in an industrial scale on a running forming fabric of a paper machine, dewatered by suction through the web and the forming fabric, and finally dried in a drying section of the paper machine.
  • the dewatering can also be performed for example on a three-dimensional, water-permeable mould which allows for retaining of the fibers but removal of the water.
  • the drying will be performed by hot air, microwave drying or other suitable drying methods which are in general known by the skilled in the art.
  • three-dimensional bodies can be manufactured which are e.g. suitable as packaging or isolating materials.
  • Another embodiment of the invention comprises dewatering the web by suction of air through the web and the forming fabric at a pressure of at most 0.6 bar, followed by predrying by suction of air at a pressure of at most about 0.3 bar.
  • the fibrous components incorporated in the foam consist of about 5 to 40 wt-%, preferably 10 to 40 wt-% and most preferably 10 to 25 wt-% of Lyocell fibers and about 60 to 95 wt-%, preferably 60 to 90 wt-% and most preferably 75 to 90 wt-% of pulp with longer fibres.
  • "Longer fibres” means a weight weighted average fiber length of between 1,5 and 4 mm. In particular preferred is a pulp with a maximum length of 6 mm of the longest fibers.
  • the foam is brought to an air content of 60 to 70 vol-% before being supplied onto the forming fabric.
  • the consistency of the pulp subjected to foaming may be 1 to 2 % based on the amount of water.
  • Suitable amount of surfactant in the foam may be in the range of 0.05 to 2.5 wt-%, but will be easily determinable by a skilled person.
  • the preferred surfactant for use in the invention is sodium dodecyl sulphate (SDS), but other typical surfactants may be used as well.
  • SDS sodium dodecyl sulphate
  • Foam forming by use of long cellulosic fibres and added Lyocell fibers in the foam is thus very suitable and promising method for producing all paper grades needing best possible formation combination with best possible bending stiffness.
  • the fibrous web according to the invention which is obtainable by the method as described in the above, comprises a mixture of Lyocell fibers and a pulp of a greater fibre length as outlined above, and has a bulk of between 2,5 cm 3 /g and 15 cm 3 /g, preferably of between 8,0 cm 3 /g and 11 cm 3 /g.
  • the Lyocell fibers are Lyocell fibers with a titer of between 0,5 and 30 dtex, preferably between 0,9 and 15 dtex, a cut length of between 1 and 40 mm and a fibrillation coefficient Q of between 10 and 65. Bulk is calculated as ((weight per unit area) x (thickness)) -1 .
  • the Lyocell fibers are Lyocell fibers with an increased tendency to fibrillate ("CLY-HF").
  • the Lyocell fibers in the fibrous web are Lyocell fibers with a cut length of between 2,5 and 22 mm, especially preferred between 3 and 12 mm, and in particular preferred between 4 and 10 mm. Shorter Lyocell fibers will not enhance the physical properties of the fibrous web and longer Lyocell fibers cannot be dispersed with sufficient homogeneity within the whole process.
  • the fibrous web comprises about 5 to 40 wt-% of Lyocell fibers and about 60 to 95 wt-% of pulp with longer fibres.
  • the fibrous web comprises 10 to 40 wt-% and most preferably 10 to 25 wt-% of Lyocell fibers and about 60 to 95 wt-%, preferably 60 to 90 wt-% and most preferably 75 to 90 wt-% of pulp with longer fibres.
  • "Longer fibres” means a weight weighted average fiber length of between 1,5 and 4 mm. In particular preferred is a pulp with a maximum length of 6 mm of the longest fibers.
  • Such products include for example all paper grades suitable for nonwoven products such as but not limited to wipes, in particular wet wipes, baby wipes, cosmetic wipes, facial masks, other body care wipes, wipes for technical and cleaning uses, toilet tissues, etc..
  • the high bulk high strength structure achieved according to the invention can also be used for example:
  • the fibrous web according to the invention can be used as a single layer in a multilayer paperboard or cardboard, it is preferably positioned as a middle layer, while the outer surface layers may be fibrous webs of a lower bulk than said middle layer.
  • the foam forming technique according to the invention it is possible to produce all the layers of a multilayer board by the foam forming technique according to the invention.
  • Another aspect of the present invention is the use of the fibrous web described herein for the manufacture of a wipe, wherein the fibrous web is used as at least one layer of the wipe.
  • the fibrous web can be used as a middle layer of the wipe while the wipe further contains outer layers having a bulk lower than in the middle layer.
  • fibrous web according to the invention can also be, among others, dispersible wet wipes, flushable wipes, dry wipes, paper towels, facial masks (also flushable facial masks), napkins, disposable tablecloths, absorbent core products, sealing materials and the like.
  • Fast fibrillating Lyocell fibers are manufactured as follows: a Lyocell fiber tow having an individual fiber titer of 1.7 dtex is impregnated with diluted sulfuric acid at room temperature and a liquor ratio of 1:10 and pressed to approximately 200% moisture. The impregnated fiber tow is subjected to steam under pressure for approximately 10 min in a laboratory steamer, then washed free of acid with water, and dried. The dry fiber tow is cut to a staple length of 6 mm.
  • the webs were manufactured according to the following general procedure: Raw materials used: Pulp: A commercially available longfiber spruce Kraft pulp with a weight weighted average fiber length of 2,6 mm.
  • Fiber content the content of these fibers hereinafter is named "Fiber content” while the remaining quantity is pulp
  • the trial set-up at the pilot-scale paper machine SUORA included using foam generation in a pulper and a hybrid former (containing the head box and the dewatering and defoaming section).
  • a pulp suspension was prepared by filling the required amount of water into the pulper and then adding the pulp while stirring. Thereafter sodium dodecyl sulfate (SDS, a tenside) was dosed into the pulper at a feed rate adjusted to control the foam density (target foam density 500 kg/m 3 ). Then the production phase was started. When all steps of the process were stabilized the man-made fiber was added into the pulper to obtain the ratio pulp:man-made fiber according to Table 1.
  • SDS sodium dodecyl sulfate
  • the basis weight per unit area target for the nonwoven samples was set to 70 gsm in all trials.
  • the machine speed was 500 m/min in all trials and the wet pressing load at the final dewatering pressing unit was 600 kN/m. After this squeezing the nonwoven material thus formed was collected on a winding unit. At this wet pressing load the solids content of the nonwoven material at the winding unit ranged from 38,9%-46,3%.
  • the samples were dried in a discontinuous laboratory drum drier and reconditioned before testing.
  • the tensile strength values which are listed below were measured according to DIN 29073 section 3 (identical to ISO 9073-3) in machine direction (MD) and cross direction (CD). The values which are measured here are the maximum force at break in the unit Newton as well as the elongation in %.
  • Example 2 show that the papers made according to the invention showed even in the original dried state an equal or even higher tenacity (i.e. strength) in both directions as papers consisting of pure pulp, while the blends with other man-made cellulosic fibers always show decreased tenacity compared to pure pulp paper made according to the same procedure.
  • Foam laid handsheets of the size of a A4 piece of paper were made by the following procedure: Foam was produced by mixing water and sodium dodecyl sulphate (SDS) as a surface active agent in ratio 0.15-0.2 g/l with a stirrer (3500 rpm) as far as the air content of foam is 60-70%.
  • SDS sodium dodecyl sulphate
  • the target air content of foam was determined by the foaming set-up; when the foam reaches the target air content the level of the foam surface does not rise anymore and the mixing starts to decrease the bubble size of the foam.
  • the webs were dried according to the following method:
  • the wet sample sheets in the size of A4 were dried on a special drum dryer: This dryer rotates (1 cycle within 3 minutes) to dry the sample to a bone dry state.
  • a woven fabric presses the sample onto the heated drum. As a certain area at the bottom end of the dryer is open, the sheet falls down into a gathering section when passing through the whole process. After drying the bone dry sheets are reconditioned in a reconditioning room overnight.
  • tensile strength values which are shown in Fig. 3 and Fig. 4 were measured according to DIN 29073 section 3 (identical to ISO 9073-3) in machine direction (MD) and cross direction (CD).
  • MD machine direction
  • CD cross direction
  • the samples were rewetted with 150w.-% of water to 2,5 times its dry weight.
  • the rewetted state is the state commercially relevant as wet wipes are usually produced by the converter (the roll good producer produced the fabric, the converter converts the fabric by adding lotion and slitting the wipe to its needed size).
  • Example 3 in the rewetted state the papers made according to the invention show a gain in wet strength compared to the 100% pulp product. Also when comparing the papers made according to the invention to the other fibers, the CLY-HF again shows a benefit. This effect is seen clearly in MD as well as in CD.
  • the strength of the sheets made according to the invention are higher.
  • the tensile strength goes down. Lyocell fiber herewith does not show this effect.
  • MD the tensile strength is comparable, in CD there is a gain in tensile strength.

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Claims (15)

  1. Procédé de fabrication d'une nappe fibreuse en papier, comprenant les étapes suivantes :
    a. mise à disposition d'une mousse faite d'eau et d'un tensio-actif,
    b. incorporation, dans la mousse, de fibres lyocell et d'une pâte à fibres relativement longues,
    c. amenée de la mousse sur une toile de formation,
    d. déshydratation de la mousse par aspiration sur la toile de formation afin de former une nappe et
    e. séchage final de la nappe,
    caractérisé en ce que les fibres lyocell sont des fibres lyocell ayant un titre compris entre 0,5 et 30 dtex, de préférence entre 0,9 et 15 dtex, une longueur de coupe comprise entre 1 et 40 mm, et présentant un coefficient de fibrillation Q compris entre 10 et 65.
  2. Procédé selon la revendication 1, caractérisé en ce que les fibres lyocell sont des fibres lyocell présentant un coefficient de fibrillation Q compris entre 10 et 50.
  3. Procédé selon la revendication 1, caractérisé en ce que les fibres lyocell sont des fibres lyocell présentant une tendance accrue à la fibrillation.
  4. Procédé selon la revendication 1, caractérisé en ce qu'une nappe continue est formée sur une toile de formation continue d'une machine à papier, déshydratée par aspiration à travers la nappe et la toile de formation, et finalement, séchée dans la partie sécherie de la machine à papier.
  5. Procédé selon la revendication 1, caractérisé en ce que la nappe est déshydratée par aspiration d'air à travers la nappe et la toile de formation à une pression de 0,6 bar maximum, suivie d'un pré-séchage par aspiration d'air à une pression maximale de 0,3 bar environ.
  6. Procédé selon l'une quelconque des revendications ci-dessus, caractérisé en ce que les composants fibreux incorporés dans la mousse sont constitués d'environ 5 à 40 % en masse, de préférence de 10 à 40 % en masse, et mieux encore de 10 à 25 % en masse de fibres lyocell, et d'environ 60 à 95 % en masse, de préférence de 60 à 90 % en masse, et mieux encore de 75 à 90 % en masse de pâte à fibres relativement longues.
  7. Procédé selon l'une quelconque des revendications ci-dessus, caractérisé en ce que la mousse obtient une teneur en air comprise entre 60 et 70 % en masse avant d'être amenée sur la toile de formation.
  8. Nappe fibreuse pouvant être fabriquée au moyen du procédé selon l'une quelconque des revendications ci-dessus, caractérisée en ce que la nappe contient un mélange de fibres lyocell et d'une pâte à fibres relativement longues, et que la nappe présente un volume d'au moins 2,5 cm3/g, de préférence compris entre 8,0 cm3/g et 11 cm3/g, caractérisée en ce que les fibres lyocell sont des fibres lyocell ayant un titre compris entre 0,5 et 30 dtex, de préférence entre 0,9 et 15 dtex, une longueur de coupe comprise entre 1 et 40 mm, et présentant un coefficient de fibrillation Q compris entre 10 et 65.
  9. Nappe fibreuse selon la revendication 8, caractérisée en ce que les fibres lyocell sont des fibres lyocell présentant un coefficient de fibrillation Q compris entre 10 et 50.
  10. Nappe fibreuse selon la revendication 8, caractérisée en ce que les fibres lyocell sont des fibres lyocell présentant une tendance accrue à la fibrillation.
  11. Nappe fibreuse selon la revendication 8, caractérisée en ce que la nappe présente un volume compris entre 2,5 cm3/g et 15,0 cm3/g, et mieux encore un volume compris entre 8,0 cm3/g et 11,0 cm3/g.
  12. Nappe fibreuse selon la revendication 8, caractérisée en ce que la nappe contient environ 5 à 40 % en masse, de préférence 10 à 40 % en masse, et mieux encore 10 à 25 % en masse de fibres lyocell, ainsi qu'environ 60 à 95 % en masse, de préférence 60 à 90 % en masse, et mieux encore 75 à 90 % en masse de pâte à fibres relativement longues.
  13. Utilisation de la nappe fibreuse selon l'une quelconque des revendications 8 à 12 pour la fabrication d'une lingette, caractérisée en ce que la nappe fibreuse constitue au moins une couche de la lingette.
  14. Utilisation selon la revendication 13, caractérisée en ce que la nappe fibreuse est utilisée comme couche centrale de la linguette et que la lingette comprend en outre des couches externes qui présentent un volume inférieur à celui de la couche centrale.
  15. Utilisation de la nappe fibreuse selon l'une quelconque des revendications 8 à 14 pour la fabrication de lingettes humides jetables, de lingettes jetables dans les toilettes, de lingettes sèches, de mouchoirs en papier, de masques pour le visage (et de masques pour le visage jetables dans les toilettes), de serviettes, de nappes de table jetables, de produits à cœur absorbant, de matériaux d'étanchéité, de lingettes humides, de lingettes pour bébé, de lingettes cosmétiques, d'autres lingettes de soins corporels, de lingettes à usage technique et de nettoyage, et de papier toilette.
EP16713279.4A 2015-06-11 2016-02-29 Utilisation de fibres cellulosique pour la fabrication d'un non-tissé Active EP3307951B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA368/2015A AT517303B1 (de) 2015-06-11 2015-06-11 Verwendung cellulosischer Fasern zur Herstellung eines Vliesstoffes
PCT/AT2016/000022 WO2016197156A1 (fr) 2015-06-11 2016-02-29 Utilisation de fibres cellulosiques pour la fabrication d'un non-tissé

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EP3307951A1 EP3307951A1 (fr) 2018-04-18
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EP (1) EP3307951B1 (fr)
JP (1) JP7028400B2 (fr)
KR (1) KR102645758B1 (fr)
CN (1) CN107683358A (fr)
AT (1) AT517303B1 (fr)
ES (1) ES2770000T3 (fr)
WO (1) WO2016197156A1 (fr)

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Publication number Publication date
US20180163345A1 (en) 2018-06-14
KR20180018656A (ko) 2018-02-21
US10604897B2 (en) 2020-03-31
JP2018521232A (ja) 2018-08-02
AT517303B1 (de) 2018-02-15
EP3307951A1 (fr) 2018-04-18
JP7028400B2 (ja) 2022-03-02
ES2770000T3 (es) 2020-06-30
CN107683358A (zh) 2018-02-09
KR102645758B1 (ko) 2024-03-07
WO2016197156A1 (fr) 2016-12-15
AT517303A1 (de) 2016-12-15

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